Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 08, 2016 - October 10, 2016
The propagation time of dispersive wave is evaluated by frequency filter using wavelet transform by Gabor function mother wavelet. Using S0 mode Lamb wave, the optimal frequency filter bandwidth of Gabor function for propagation time evaluation was discussed by changing γ parameter of Gabor function. The γ values which minimize propagation time evaluation error were observed for each frequency. At these γ values, the half-value-width of each wavelet coefficient was the narrowest compared to the other γ values. Thus to evaluate propagation time accurately, this optimal γ value which minimize the wavelet coefficient half-value-width should be used. At the optimal γ value, it was shown that the Gabor function could extract much information from original waveform at particular frequency, thus the evaluation error became lowest.
